> If I try again and some of the 403s are working, the data 
of
> the file is appended to the already existing file with the
> HTML code.

Appended ?! This is definitely a weird behaviour - and the 
problem was never reported AFAIK. The only way to trace the 
problem would be to activate the extended debug mode 
(Experts only / Debug checkbox) and look in the hts-
ioinfo.txt file to track the problem.